[4910-13-P]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2023-1811; Project Identifier MCAI-2023-00146-E]
RIN 2120-AA64
Airworthiness Directives; GE Aviation Czech s.r.o. (Type Certificate Previously
held by WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD) 2023-0107, which applies to all GE Aviation Czech s.r.o. (GEAC) (type certificate previously
held by WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) Model H75-100,
H75-200, H80, H80-100, H80-200, H85-100, and H85-200 engines. AD 2023-01-07
requires revising the airworthiness limitations section (ALS) of the existing engine
maintenance manual (EMM) and the operator’s existing approved maintenance or
inspection program, as applicable, to incorporate updated coefficients and recalculate the
cycles accumulated on critical parts. Since the FAA issued AD 2023-01-07, the
manufacturer revised the ALS of the EMM to introduce new and more restrictive
airworthiness limitations and associated thresholds and intervals for life-limited parts,
which prompted this proposed AD. This proposed AD would require revising the ALS of
the existing EMM and the operator’s existing approved engine maintenance or inspection
program, as applicable, to incorporate new and more restrictive instructions and
associated thresholds and intervals for life-limited parts, as specified in a European Union
Aviation Safety Agency (EASA) AD, which is proposed for incorporation by reference
(IBR). The FAA is proposing this AD to address the unsafe condition on these products.
DATES: The FAA must receive comments on this NPRM by [INSERT DATE 45 DAYS
AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].
ADDRESSES: You may send comments, using the procedures found in 14 CFR 11.43
and 11.45, by any of the following methods:

• Federal eRulemaking Portal: Go to regulations.gov. Follow the instructions for
submitting comments.
• Fax: (202) 493-2251.
• Mail: U.S. Department of Transportation, Docket Operations, M-30, West
Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE, Washington, DC
20590.
• Hand Delivery: Deliver to Mail address above between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal holidays.
AD Docket: You may examine the AD docket at regulations.gov under Docket No. FAA2023-1811; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday
through Friday, except Federal holidays. The AD docket contains this NPRM, the
mandatory continuing airworthiness information (MCAI), any comments received, and
other information. The street address for Docket Operations is listed above.
Material Incorporated by Reference:
• For service information that is proposed for IBR in this NPRM, contact EASA,
Konrad-Adenauer-Ufer 3, 50668 Cologne, Germany; phone: +49 221 8999 000; email:
ADs@easa.europa.eu; website: easa.europa.eu. You may find this material on the EASA
website at ad.easa.europa.eu. It is also available at regulations.gov under Docket No.
FAA-2023-1811.
• You may view this service information at the FAA, Airworthiness Products
Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA 01803. For
information on the availability of this material at the FAA, call (817) 222-5110.
FOR FURTHER INFORMATION CONTACT: Barbara Caufield, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (781)
238-7146; email: barbara.caufield@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA invites you to send any written relevant data, views, or arguments about
this proposal. Send your comments to an address listed under ADDRESSES. Include
“Docket No. FAA-2023-1811; Project Identifier MCAI-2023-00146-E” at the beginning

of your comments. The most helpful comments reference a specific portion of the
proposal, explain the reason for any recommended change, and include supporting data.
The FAA will consider all comments received by the closing date and may amend the
proposal because of those comments.
Except for Confidential Business Information (CBI) as described in the following
paragraph, and other information as described in 14 CFR 11.35, the FAA will post all
comments received, without change, to regulations.gov, including any personal
information you provide. The agency will also post a report summarizing each
substantive verbal contact received about this NPRM.
Confidential Business Information
CBI is commercial or financial information that is both customarily and actually
treated as private by its owner. Under the Freedom of Information Act (FOIA) (5 U.S.C.
552), CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that
you actually treat as private, and that is relevant or responsive to this NPRM, it is
important that you clearly designate the submitted comments as CBI. Please mark each
page of your submission containing CBI as “PROPIN.” The FAA will treat such marked
submissions as confidential under the FOIA, and they will not be placed in the public
docket of this NPRM. Submissions containing CBI should be sent to Barbara Caufield,
Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590.
Any commentary that the FAA receives which is not specifically designated as CBI will
be placed in the public docket for this rulemaking.
Background
The FAA issued AD 2023-01-07, Amendment 39-22301 (88 FR 7355,
February 3, 2023; corrected February 16, 2023 (88 FR 10013)) (AD 2023-01-07), for all
GEAC Model H75-100, H75-200, H80, H80-100, H80-200, H85-100, and H85-200
engines. AD 2023-01-07 was prompted by an MCAI originated by EASA, which is the
Technical Agent for the Member States of the European Union. EASA issued EASA AD
2022-0008, dated January 19, 2022 (EASA AD 2022-0008), to address an unsafe
condition identified as failure of the engine. EASA AD 2022-0008 stated that the

airworthiness limitations for H series engine models have been identified as mandatory
for continued airworthiness, and that failure to accomplish these instructions could result
in an unsafe condition. EASA AD 2022-0008 also explained that the manufacturer
published a revised ALS to introduce updated coefficients for the calculation of the cyclic
life and safe life for the main shaft.
AD 2023-01-07 requires revising the ALS of the existing EMM and the operator’s
existing approved maintenance or inspection program, as applicable, to incorporate
updated coefficients and recalculate the cycles accumulated on critical parts. The FAA
issued AD 2023-01-07 to prevent failure of the engine.
Actions Since AD 2023-01-07 was Issued
Since the FAA issued AD 2023-01-07, EASA superseded EASA AD 2022-0008
and issued EASA AD 2023-0021, dated January 23, 2023 (EASA AD 2023-0021) (also
referred to after this as the MCAI). The MCAI states that the manufacturer revised the
ALS to introduce new and more restrictive instructions and associated thresholds and
intervals for life-limited parts. The MCAI also states that GEAC published an Alert
Service Bulletin, ASB-H75-72-10-00-0062, ASB-H80-72-10-00-0107, ASB-H85-72-1000-0051, ASB-M601F-72-10-00-0070, ASB-M601E-72-10-00-0120, ASB-M601D-7210-00-0087 and ASB-M601Z-72-10-00-0069; Revision 1, dated January 20, 2023,
published as a single document, which provides instructions to determine the
accumulated life of certain propeller shafts.
You may examine the MCAI in the AD docket at regulations.gov under Docket
No. FAA-2023-1811.
Related Service Information under 1 CFR Part 51
The FAA reviewed EASA AD 2023-0021, which specifies procedures for
operators to revise the ALS of the existing EMM and the operator’s existing approved
engine maintenance or inspection program, as applicable, to incorporate new and more
restrictive instructions and associated thresholds and intervals for life-limited parts, as
applicable to each engine model.

This service information is reasonably available because the interested parties
have access to it through their normal course of business or by the means identified in
ADDRESSES.
FAA’s Determination
These products have been approved by the aviation authority of another country
and are approved for operation in the United States. Pursuant to the FAA’s bilateral
agreement with this State of Design Authority, it has notified the FAA of the unsafe
condition described in the MCAI referenced above. The FAA is issuing this NPRM after
determining that the unsafe condition described previously is likely to exist or develop on
other products of the same type design.
Proposed AD Requirements in this NPRM
This proposed AD would require accomplishing the actions specified in the
MCAI described previously, except for any differences identified as exceptions in the
regulatory text of this proposed AD and as discussed under “Differences Between this
Proposed AD and the MCAI.” The owner/operator (pilot) holding at least a private pilot
certificate may revise the ALS of the existing EMM and must enter compliance with the
applicable paragraph of this proposed AD into the engine maintenance records in
accordance with 14 CFR 43.9(a) and 91.417(a)(2)(v). The pilot may perform this action
because it only involves revising the pilot’s manual. This action could be performed
equally well by a pilot or a mechanic. This is an exception to the FAA’s standard
maintenance regulations.
Explanation of Required Compliance Information
In the FAA’s ongoing efforts to improve the efficiency of the AD process, the
FAA developed a process to use some civil aviation authority (CAA) ADs as the primary
source of information for compliance with requirements for corresponding FAA ADs.
The FAA has since coordinated with other manufacturers and CAAs to use this process.
As a result, the FAA proposes to incorporate by reference EASA AD 2023-0021 in the
FAA final rule. This proposed AD would, therefore, require compliance with EASA AD
2023-0021 in its entirety through that incorporation, except for any differences identified
as exceptions in the regulatory text of this proposed AD. Using common terms that are

the same as the heading of a particular section in the EASA AD does not mean that
operators need comply only with that section. For example, where the AD requirement
refers to “all required actions within the compliance times,” compliance with this AD
requirement is not limited to the section titled “Required Action(s) and Compliance
Time(s)” in EASA AD 2023-0021. Service information required by the EASA AD for
compliance will be available at regulations.gov by searching for and locating Docket No.
FAA-2023-1811 after the FAA final rule is published.
Differences Between this Proposed AD and the MCAI
Where EASA AD 2023-0021 defines the AMP as the approved Aircraft
Maintenance Programme containing the tasks on the basis of which the scheduled
maintenance is conducted to ensure the continuing airworthiness of each operated engine,
this proposed AD defines the AMP as the aircraft maintenance program containing the
tasks on the basis of which the scheduled maintenance is conducted to ensure the
continuing airworthiness of each operated airplane.
Where EASA AD 2023-0021 defines the ALS as the Airworthiness Limitations
Section of the GEAC EMM No. 0983402 Revision 25, dated November 21, 2022, this
proposed AD defines the ALS as the airworthiness limitations section of the GEAC
EMM No. 0983402 Revision 26, dated February 1, 2023. The ALS in Revision 26 of the
EMM is unchanged from Revision 25 of the EMM.
Where paragraph (3) of EASA AD 2023-0021 specifies revising the approved
Aircraft Maintenance Programme within 12 months after the effective date of EASA
AD 2023-0021, this proposed AD would require revising the ALS of the existing
approved engine maintenance or inspection program, as applicable, within 90 days after
the effective date of this AD.
This proposed AD would not require compliance with paragraphs (1), (2), (4), and
(5) of EASA AD 2023-0021.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would affect 33 engines
installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this proposed AD:

Estimated costs
Action

Labor Cost

Parts Cost

Cost per
product

Cost on U.S.
operators

Revise the
ALS

1 work-hour x
$85 per hour =
$85

$0

$85

$2,805

Authority for this Rulemaking
Title 49 of the United States Code specifies the FAA’s authority to issue rules on
aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator.
Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency’s
authority.
The FAA is issuing this rulemaking under the authority described in Subtitle VII,
Part A, Subpart III, Section 44701: General requirements. Under that section, Congress
charges the FAA with promoting safe flight of civil aircraft in air commerce by
prescribing regulations for practices, methods, and procedures the Administrator finds
necessary for safety in air commerce. This regulation is within the scope of that authority
because it addresses an unsafe condition that is likely to exist or develop on products
identified in this rulemaking action.
Regulatory Findings
The FAA determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would not have a
substantial direct effect on the States, on the relationship between the national
Government and the States, or on the distribution of power and responsibilities among the
various levels of government.
For the reasons discussed above, I certify that the proposed regulation:
(1) Is not a “significant regulatory action” under Executive Order 12866,
(2) Would not affect intrastate aviation in Alaska, and
(3) Would not have a significant economic impact, positive or negative, on a
substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

The Proposed Amendment
Accordingly, under the authority delegated to me by the Administrator, the FAA
proposes to amend 14 CFR part 39 as follows:
PART 39 - AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
§ 39.13 [Amended]
2. The FAA amends § 39.13 by:
a. Removing Airworthiness Directive 2023-01-07, Amendment 39-22301 (88 FR
7355, February 3, 2023; corrected February 16, 2023 (88 FR 10013)); and
b. Adding the following new airworthiness directive:
GE Aviation Czech s.r.o. (Type Certificate Previously held by WALTER Engines
a.s., Walter a.s., and MOTORLET a.s.): Docket No. FAA-2023-1811; Project
Identifier MCAI-2023-00146-E.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive (AD) by
[INSERT DATE 45 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL
REGISTER].
(b) Affected ADs
This AD replaces AD 2023-01-07, Amendment 39-22301 (88 FR 7355,
February 3, 2023; corrected February 16, 2023 (88 FR 10013)).
(c) Applicability
This AD applies to GE Aviation Czech s.r.o. (Type Certificate Previously held by
WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) Model H75-100, H75-200,
H80, H80-100, H80-200, H85-100, and H85-200 engines.
(d) Subject
Joint Aircraft System Component (JASC) Code 7200, Engine
(Turbine/Turboprop).

(e) Unsafe Condition
This AD was prompted by the manufacturer revising the airworthiness limitations
section (ALS) of the existing engine maintenance manual (EMM) to introduce new and
more restrictive airworthiness limitations and associated thresholds and intervals for lifelimited parts. The FAA is issuing this AD to prevent failure of the engine. The unsafe
condition, if not addressed, could result in uncontained release of a critical part, damage
to the engine, and damage to the airplane.
(f) Compliance
Comply with this AD within the compliance times specified, unless already done.
(g) Required Actions
(1) Except as specified in paragraph (h) of this AD: Perform all required actions
within the compliance times specified in, and in accordance with, European Union
Aviation Safety Agency (EASA) AD 2023-0021, dated January 23, 2023 (EASA
AD 2023-0021).
(2) The action required by paragraph (g)(1) of this AD may be performed by the
owner/operator (pilot) holding at least a private pilot certificate and must be entered into
the aircraft records showing compliance with this AD in accordance with 14 CFR 43.9(a)
and 91.417(a)(2)(v). The record must be maintained as required by 14 CFR 91.417,
121.380, or 135.439.
(h) Exceptions to EASA AD 2023-0021
(1) Where EASA AD 2023-0021 defines the AMP as “the approved Aircraft
Maintenance Programme containing the tasks on the basis of which the scheduled
maintenance is conducted to ensure the continuing airworthiness of each operated
engine,” for this AD, replace that text with, “the aircraft maintenance program containing
the tasks on the basis of which the scheduled maintenance is conducted to ensure the
continuing airworthiness of each operated airplane.”
(2) Where EASA AD 2023-0021 defines the ALS as “the Airworthiness
Limitations Section of GEAC EMM No. 0983402 Revision 25, dated November 21,
2022,” for this AD, replace that text with, “the airworthiness limitations section of GEAC

EMM No. 0983402 Revision 26, dated February 1, 2023.” The ALS in Revision 26 of the
EMM is unchanged from Revision 25 of the EMM.
(3) Where EASA AD 2023-0021 refers to its effective date, this AD requires
using the effective date of this AD.
(4) Where paragraph (3) of EASA AD 2023-0021 specifies revising “the
approved AMP within 12 months after the effective date of EASA AD 2023-0021,”
replace that text with, “the ALS of the existing approved engine maintenance or
inspection program, as applicable, within 90 days after the effective date of this AD.”
(5) This AD does not require compliance with paragraphs (1), (2), (4), and (5) of
EASA AD 2023-0021.
(6) This AD does not adopt the Remarks paragraph of EASA AD 2023-0021.
(i) Provisions for Alternative Actions and Intervals
After performing the actions required by paragraph (g) of this AD, no alternative
actions and associated thresholds and intervals, including life limits, are allowed unless
they are approved as specified in the provisions of the “Ref. Publications” section of
EASA AD 2023-0021.
(j) Alternative Methods of Compliance (AMOCs):
(1) The Manager, International Validation Branch, FAA, has the authority to
approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19.
In accordance with 14 CFR 39.19, send your request to your principal inspector or local
Flight Standards District Office, as appropriate. If sending information directly to the
manager of the International Validation Branch, send it to the attention of the person
identified in paragraph (k) of this AD and email to ANE-AD-AMOC@faa.gov.
(2) Before using any approved AMOC, notify your appropriate principal
inspector, or lacking a principal inspector, the manager of the local flight standards
district office/certificate holding district office.
(k) Additional Information
For more information about this AD, contact Barbara Caufield, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (781)
238-7146; email: barbara.caufield@faa.gov.

(l) Material Incorporated by Reference
(1) The Director of the Federal Register approved the incorporation by reference
(IBR) of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR
part 51.
(2) You must use this service information as applicable to do the actions required
by this AD, unless the AD specifies otherwise.
(i) European Union Aviation Safety Agency AD 2023-0021, dated January 23,
2023.
(ii) [Reserved]
(3) For EASA AD 2023-0021, contact EASA, Konrad-Adenauer-Ufer 3, 50668
Cologne, Germany; phone: +49 221 8999 000; email: ADs@easa.europa.eu; website:
easa.europa.eu. You may find this EASA AD on the EASA website at ad.easa.europa.eu.
(4) You may view this service information at FAA, Airworthiness Products
Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA 01803. For
information on the availability of this material at the FAA, call (817) 222-5110.
(5) You may view this service information that is incorporated by reference at the
National Archives and Records Administration (NARA). For information on the
availability of this material at NARA, email: fr.inspection@nara.gov, or go to:
www.archives.gov/federal-register/cfr/ibr-locations.html.
Issued on August 25, 2023.

Victor Wicklund, Deputy Director,
Compliance & Airworthiness Division,
Aircraft Certification Service.
[FR Doc. 2023-18930 Filed: 9/5/2023 8:45 am; Publication Date: 9/6/2023]